CN1238039A - On-line regenerative air preheater fouling sensing system - Google Patents

On-line regenerative air preheater fouling sensing system Download PDF

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Publication number
CN1238039A
CN1238039A CN97199719.5A CN97199719A CN1238039A CN 1238039 A CN1238039 A CN 1238039A CN 97199719 A CN97199719 A CN 97199719A CN 1238039 A CN1238039 A CN 1238039A
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CN
China
Prior art keywords
sensing system
rotor
fouling
air
sensor
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Pending
Application number
CN97199719.5A
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Chinese (zh)
Inventor
W·S·康特曼
J·D·瑟巴尔德
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Alsthom Power Co.
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ABB Air Preheater Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ABB Air Preheater Inc filed Critical ABB Air Preheater Inc
Publication of CN1238039A publication Critical patent/CN1238039A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
    • F28F27/006—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus specially adapted for regenerative heat-exchange apparatus

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Supply (AREA)
  • Motor Or Generator Cooling System (AREA)

Abstract

A fouling sensing system (42) monitors fouling of a rotary regenerative preheater (10) having a housing (12) and a rotor (14) rotatably mounted therein. An emitter (48) for emitting energy is positioned at one of the faces of the rotor (14) and emits energy through the rotor (14). A sensor (54) is positioned at the other face of the rotor (14) for receiving the energy and generating an output signal indicative of the intensity of the energy.

Description

Online regenerative air preheater fouling sensing system
Background of invention
The present invention relates to be used for the field of the heat accumulating of revolution type air preheater of combustion-type electricity generation system.Specifically, the present invention relates generally to be used for the sensor-based system of heat accumulating of revolution type preheater.
The heat accumulating of revolution type preheater is known to be to be used for sending heat to preheated air stream from the flue gas stream of after heat.Traditional rotary-type regenerator preheater has circular chamber and the rotor that is rotatably mounted in wherein.Rotor includes and is used for sending heat to heat transfer piece that air flows from flue gas stream.Circular cell then limits waste gas inlet conduit, flue gas outlet conduit, air intake conduit and air outlet duct.Fanning strip is divided into air side and flue gas side with preheater, and wherein Re flue gas enters the waste gas inlet and then passes through rotor.Cold flue gas is then discharged from preheater by flue gas outlet.The air air intake of flowing through enters heater then by warmed-up rotor.The heat transfer piece of rotor is passed to this air stream with heat, and warmed-up air is discharged from preheater through air outlet duct.
Soot in the flue gas stream and other particle can deposit on the heat transfer piece of rotor.These deposits generally are gathered in the hot junction of rotor heat transport face.In addition, the flying dust in the flue gas can form the deposit or the fouling of soot in conjunction with the derivative of moisture and sulphur, particularly at the cold junction of the heating surface of rotor.The deposit of being assembled on hot end of rotor and the cold junction can influence flue gas and air stream, impairs heat transfer property.
Traditional practice is to adopt the soot spray to remove the heat transfer piece that comes rotor washing with cleaning equipment.Soot spray removes equipment and uses overfire air stream or dried compressed air and remove soot and other particle on the heat transfer piece.When spray removes when being not enough to remove deposit, just begin the washing of rotor.Cleaning equipment needs the heat accumulating of revolution type preheater is unloaded so that carry out washing and cleaning operation from production line.Traditional cleaning equipment employing water dissolves soot and other particle on the heat transfer piece.
Rotor is carried out the soot spray to fall to determine by the pressure of monitoring two ends of rotor except that required number of times usually.But prove that the monitoring that pressure falls can not indicate the idle aggregation extent of cigarette reliably.Generally, when pressure falls even as big as when the operator reports to the police, show that then the scale deposition thing has run up to the degree that is difficult to remove.So the soot spray removes operation and should begin in the time early.This formation thing for the fouling of temperature influence such as ammonium hydrogen sulfate is especially true.It is in 74～120 inches the whole parts in district's band of 12～24 inches that this class fouling typically is present in the general degree of depth.
Narrow like this scale deposition band is to make the pressure at whole parts two ends fall the degree that can detect that increases to, and only this dwindles interior open Circulation Area of district's band of fouling sharp.At this moment, because the restriction of this district's band, the length of penetration that spray removes operation will significantly reduce, thereby is difficult for removing this deposit.
Because the defective of monitoring falls in above-mentioned pressure, the winding-up operation is generally regularly carried out continually with regard to needing.Spray regularly removes owing to usually be to adopt extremely conservative frequent spray to remove progress continually, will shorten the life-span of parts usually.Frequent termly spray was not suitable for the boiler operatiopn abnormality except that having proved already, removed the situation that fouling took place on the rotor of preheater between duty cycle in the spray of planning.
Summary of the invention
Briefly, the present invention is the online regenerative air preheater fouling sensing system that is used for surveying fouling gathering situation on the heat accumulating of revolution type preheater rotor in its optimal form.
Preferred fouling sensing system of the present invention has transmitter component and sensor cluster.The transmitter component that is used to send energy is positioned among one of them conduit of the air side of heat accumulating of revolution type heater or flue gas side.Then be the sensor cluster that is used for surveying this transmitter power therewith among the conduit that the airflow duct at transmitter place is relative.This transmitter component can send electromagnetic wave, sound wave or nuclear radiation.The energy that is sent is by rotor and be the sensor cluster reception.For the energy that sends of constant level, the open channel by heat transfer piece can allow this to send percentage certain in the energy to pass through.The variation or the minimizing of monitoring sensor assembly institute received energy just can show the fouling degree on the heat transfer piece.Like this, only just can begin spray whenever necessary except that operation.Use fouling sensing system of the present invention and avoided unnecessary spray to remove operation, remove the life-span that prolongs heat transfer piece by reaching at deposit to begin to spray before the degree that is difficult to remove simultaneously.
One of purpose of the present invention is to provide and is used for surveying in the aforementioned preheater rotor the online regenerative air preheater fouling sensing system of fouling situation on the heat transfer piece.
Another object of the present invention is to provide the fouling sensing system that can allow more effectively regularly to spray except that operation.
A further object of the present invention is to provide the fouling sensing system that can be used for measuring the relative fouling degree of heat transfer piece.
Above-mentioned purpose of the present invention and other purpose can obtain to understand by reading explanation of the present invention and accompanying drawing.
The accompanying drawing summary
Fig. 1 is the figure of heat accumulating of revolution type preheater local excision;
Fig. 2 is the partial cross-sectional view that is combined with the heat accumulating of revolution type preheater of fouling sensing system of the present invention;
Fig. 3 is the partial cross-sectional view that is combined with the heat accumulating of revolution type preheater of another embodiment of fouling sensing system of the present invention.
The explanation of most preferred embodiment
The unification of heat accumulating of revolution type preheater is indicated with 10.Preheater 10 has casing 12, limits casing internal volume 13.The rotor 14 that is rotatably mounted in the casing 12 has the traditional heat exchanging piece (referring to Fig. 1) that is used for conducting heat.
Rotor 14 has axle or rotor post 18, is used for supporting rotor 14 and rotates in casing 12.Rotor draws 18 by hot junction central part 20 and cold junction central part 22.Dress is used for making warmed-up flue gas to flow through preheater 10 with waste gas inlet conduit 24 and flue gas outlet conduit 26 in the casing 12.Air intake conduit 28 and air outlet duct 30 also are installed on the casing 12, are used for making pre-combustion air to flow through preheater 10.Casing 12, flue gas conduit 24,26 and air conduit 28,30 have constituted forehearth 15.Fanning strip 32,34 extends through chamber 15, and is adjacent with the upper surface and the lower surface of rotor 14, and preheater 10 is divided into air side 36 and flue gas side 38.Indicated arrow among Fig. 1 air and flue gas flow through the direction of preheater 10.
The hot flue gases that enters by waste gas inlet conduit 24 sends heat to the heat transfer piece of the rotor 14 of continuous rotation.Warmed-up heat transfer piece forwards the air side 36 of heat accumulating of revolution type preheater 10 then to.The heat that heat transfer piece is stored just sends the combustion-supporting air flow that enters through air intake conduit 28 at this moment to.The flue gas of cooling is discharged preheater 10 by flue gas outlet conduit 26, and warmed-up pre-burning air is then discharged from preheater 10 through air outlet duct 30.
Soot in the flue gas stream, particle and compound are assembled also condensation on the heat transfer piece of rotor 14, form deposit and fouling that obstruction air and flue gas flow through preheater 10.Spray removes equipment 40 and generally is arranged in one of conduit 24,26,28,30, is used for removing these soot deposit thing and foulings from the heat transfer piece of rotor 14.Spray removes equipment 40 and preferably is arranged in flue gas outlet 26, is blown into the bellows in air side 36 downstreams that are positioned at preheater 10 in order to prevent flying dust.Spray remove equipment 40 will overheated air-flow or the compressed air of drying blow on the heat transfer piece of rotor 14 and remove fouling and deposit.
The fouling sensing system 42 of online regenerative air preheater of the present invention is arranged to survey the appropriate location (referring to Fig. 2) of the heat transfer piece fouling of rotor 14.By adopting fouling sensing system 42, can make the soot spray remove the life-span that rotor was accurately regularly raised the efficiency and prolonged in operation.Fouling sensing system 42 has transmitter component 44 and sensor cluster 46 and other suitable instrument.
Fouling sensing system 42 is positioned at the air side 36 or the flue gas side 38 of air preheater 10.Transmitter component 44 can be positioned among aforementioned four conduits 24,26,28 and 30 arbitrary, and promptly the waste gas inlet conduit 24, flue gas outlet conduit 26, air intake conduit 28 or air outlet duct 30.The side different with transmitter component 44 that 46 of sensor clusters are positioned at heat transfer piece is in the same air side 36 or the flue gas side 38 of preheater 10.Fouling sensing system 42 preferably is positioned at the air side 36 of preheater 10, so that reduce soot, particle and other contaminants on fouling sensing system 42.
Transmitter component 44 has for cramp bar 50 and is supported on transmitter source 48 in the air outlet duct.Transmitter source 48 sends the heat transfer piece that energy is used for passing rotor 14.The energy that transmitter source 48 sends can be directed electromagnetic wave such as laser or have the normal optical that spreads configuration.This electromagnetic frequency band range comprises visible and sightless wave band.Transmitter source 48 also can transmission frequency at the ultrasonic and sound wave infrasound scope, or send nuclear particle or nuclear electromagnetic radiation (X ray).The transmitter source can be by providing by the transmitter cable 52 of chamber 15 to distant place (not showing bright).The advantage in nucleon source is not need outside power source starting.In addition, adopt the radiation source the long half-lift of having to make output stable, reduce maintenance work.
Although many transmitters source can be installed more effectively to monitor whole rotor in described just transmitter source 48 on a plurality of positions of rotor radial.Single transmitter source perhaps can be installed to be made it radially to move back and forth.
The sensor 54 that sensor cluster 46 has is installed on second cramp bar 50.These suitable 54 selections with transmitter source 48 of sensor are relevant.Sensor 54 is connected on sensor instrument and the control device (not showing bright) by the sensor cable 15 by chamber 15.Sensor 54 preferably is positioned at roughly with transmitter source 48 opposite positions.If this transmitter source is mounted to forms of motion, then sensor 54 also should be mounted to it and be synchronized with the movement.Transmitter source 48 preferably sends the energy that sends of constant level.Open type passage by heat transfer piece will allow certain percentage of the energy that sends pass through.Energy variation or minimizing that sensor 46 is accepted by rotor 14 back monitoring at this energy.The amount of fouling can be associated.Monitoring this energy when reducing behind one section duration of work, promptly the operator of announcement apparatus should begin to take turns spray and removes operation.The electromagnetic transmitter source 48 of most forms all requires the sight line by the heat transfer piece of rotor 14.Sound 48 in transmitter source base or high energy nucleon base does not require the sight line of directly passing through the heat transfer piece of rotor 14.
In another embodiment of the present invention, fouling sensing system 142 has transmitter component 144 and sensor cluster 146 (referring to Fig. 3).Sensor cluster 146 also can be positioned at the flue gas side 38 or the air side 36 of preheater 10.Transmitter component 144 has a transmitter source 148 that is positioned at outside the chamber 15.Transmitter source 148 is light source preferably.The photoconduction in transmitter source 148 draws the mouth 149 by chamber 15, by speculum 151 reflections that preferably are arranged in air outlet duct 28.Speculum 151 is supported in the air outlet duct 28 by cramp bar 50.Speculum 151 reflections make it pass through the heat transfer piece of rotor 14 from the light in transmitter source 48.
Sensor cluster 146 has reflector or speculum 147, makes the mouth 145 that passes through chamber 15 from the light reflection in transmitter source 148.Sensor cluster 146 also has sensor 154, is used for receiving the light from transmitter source 148, produces the output signal that shows the light intensity that is received simultaneously.Output signal from sensor 154 sends the central control system (not shown) to by sensor cable 156.Perhaps, transmitter source 148 can be positioned on the chamber 15 with sensor 154, in conduit 24,26,28,30.
In another embodiment of sensor cluster 146, reflector or speculum 147,151 can be fibre-optic cables.The light in transmitter source 148 can be caught or gather on the fibre-optic cable, sends the sensor 15 that is positioned at reached at the position outside the chamber 15 then to.Similarly, chamber 15 was guided in the light in transmitter source 148 output fibre-optic cable thus, and guiding is surveyed by sensor cluster 146 by the heat transfer piece on the rotor 14.
Although illustrated and described in detail most preferred embodiment of the present invention above, what the expert can very fast its multiple modification of grasp.For this reason, the appended claim book promptly is used for containing and belongs to any and all these classes remodeling in connotation of the present invention and the compass of competency.

Claims (14)

1. fouling sensing system is used to monitor the fouling situation of heat accumulating of revolution type preheater, and this sensor-based system comprises: forehearth; Be rotatably mounted in this indoor rotor, described rotor defines the rotor cover of relative positioning; Be used to send sender device by the energy of this rotor; And the sensor device that is used to survey the energy that passes through described rotor that described sender device sends.
2. the described fouling sensing system of claim 1, wherein said sender device comprises electromagnet source.
3. the described fouling sensing system of claim 1, wherein said forehearth defines air side and flue gas side, and described sender device and sensor device are positioned at the air side of described forehearth.
4. the described fouling sensing system of claim 1, wherein said sender device are positioned on one of them described rotor cover and described sensor device is positioned on another rotor cover.
5. fouling sensing system is used to monitor the fouling situation of heat accumulating of revolution type hot spot, and this sensor-based system comprises: define the casing of flue gas side and air side, this air side comprises air intake conduit and relative air outlet duct; Be rotatably mounted in the rotor between described air intake conduit and air outlet duct, to rotate in the said machine casing; Be arranged in one of this air intake conduit and air outlet duct and be used for sending sender device by the energy of described rotor; And be positioned at the detector means that being used within another of above-mentioned entry conductor and delivery channel surveyed the energy that described sensor device sends out.
6. the described fouling sensing system of claim 5, wherein said sender device comprises electromagnet source and described sensor device comprises electromagnetic sensor.
7. the described fouling sensing system of claim 5, wherein said sender device comprises sound source and described sensor device comprises sonic transducer.
8. the described fouling sensing system of claim 5, wherein said sender device comprises nuclear radiation source and described sensor device comprises nuclear radiation transducer.
9. fouling sensing system is used to monitor the fouling situation of heat accumulating of revolution type preheater, and this fouling sensing system comprises: forehearth, and this chamber has flue gas side and air side, and air side comprises the air outlet duct of air intake conduit and relative positioning; Be rotatably mounted in above-mentioned indoor rotor, send the sender device of electromagnetic energy to one of this air intake conduit and air outlet duct between this air intake conduit and air outlet duct, to rotate; Within a described conduit, be used for reflecting reflector arrangement by the electromagnetic energy of this rotor; And the sensor device that is used for surveying the energy that passes through this rotor that is sent.
10. the described fouling sensing system of claim 9, wherein said reflector arrangement comprises fibre-optic cable.
11. the described fouling sensing system of claim 9, wherein said sensor device is included in above-mentioned air intake conduit and air outlet duct second reflector arrangement and within another at described outdoor sensor, and described second reflector arrangement can be used to described outdoor electromagnetic energy is reflexed on the sensor.
12. the described fouling sensing system of claim 11, wherein said second reflector arrangement comprises fibre-optic cable.
13. the described fouling sensing system of claim 11, wherein said second reflector arrangement comprises speculum.
14. the described fouling sensing system of claim 9, wherein said reflector arrangement comprises speculum.
CN97199719.5A 1996-11-15 1997-10-16 On-line regenerative air preheater fouling sensing system Pending CN1238039A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/746,775 US5762128A (en) 1996-11-15 1996-11-15 On-line regenerative air preheater fouling sensing system
US08/746,775 1996-11-15

Publications (1)

Publication Number Publication Date
CN1238039A true CN1238039A (en) 1999-12-08

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Application Number Title Priority Date Filing Date
CN97199719.5A Pending CN1238039A (en) 1996-11-15 1997-10-16 On-line regenerative air preheater fouling sensing system

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US (1) US5762128A (en)
EP (1) EP0948733B1 (en)
JP (1) JP2000509481A (en)
CN (1) CN1238039A (en)
BR (1) BR9713073A (en)
CA (1) CA2270888A1 (en)
WO (1) WO1998021540A1 (en)

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JP5713884B2 (en) * 2011-12-22 2015-05-07 アルヴォス テクノロジー リミテッドＡＲＶＯＳ Ｔｅｃｈｎｏｌｏｇｙ Ｌｉｍｉｔｅｄ Rotating regenerative heat exchanger
WO2013114950A1 (en) * 2012-01-30 2013-08-08 富士電機株式会社 Scale deposition testing device
GB201219764D0 (en) * 2012-11-02 2012-12-19 Epsco Ltd Method and apparatus for inspection of cooling towers
JP7047313B2 (en) * 2017-10-04 2022-04-05 栗田工業株式会社 Dirt measurement method and cleaning effect evaluation method for regenerative air preheater
CN109185914A (en) * 2018-09-18 2019-01-11 北京质为科技有限公司 A kind of anti-clogging rotary regenerative air preheater
CN113623681A (en) * 2021-08-09 2021-11-09 上海市东方海事工程技术有限公司 Air preheater cold end monitoring system and monitoring process

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Publication number Publication date
EP0948733B1 (en) 2002-02-27
CA2270888A1 (en) 1998-05-22
EP0948733A1 (en) 1999-10-13
US5762128A (en) 1998-06-09
WO1998021540A1 (en) 1998-05-22
BR9713073A (en) 2000-04-11
JP2000509481A (en) 2000-07-25

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Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
ASS Succession or assignment of patent right

Owner name: ALSTOM POWER CO.,LTD.

Free format text: FORMER OWNER: ABB AIR PREHEATER CO., LTD.

Effective date: 20010614

C41 Transfer of patent application or patent right or utility model
TA01 Transfer of patent application right

Effective date of registration: 20010614

Applicant after: Alsthom Power Co.

Applicant before: ABB air Preheater, Inc.

AD01 Patent right deemed abandoned
C20 Patent right or utility model deemed to be abandoned or is abandoned